In-mould shell construction. 11 air vents. Rear vents for optimum airflow. Click-on LED rear light with easy replaceable batteries. Insect mesh protects against insects flying into the helmet. Adjustable straps for a perfect and comfortable fit. Easy TwistClose adjustment system, can be adjusted with one hand. Washable anti-bacterial pads. Rear reflective stickers. Size: M (51-55cm).